Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Revenue	$ 279,530	$ 269,220	$ 546,920	$ 540,292
Cost of goods sold	209,303	204,126	412,416	413,253
Gross profit	70,227	65,094	134,504	127,039
Operating expenses:
Selling, general and administrative expenses	55,086	51,418	108,513	102,910
Depreciation and amortization	3,182	4,721	6,086	9,316
Change in fair value of contingent consideration	1,884	7,276	844	9,187
Restructuring and other charges	0	623	0	3,967
Income from operations	10,075	1,056	19,061	1,659
Other income (expense):
Interest income	12	24	46	38
Interest expense	(1,038)	(985)	(2,041)	(2,062)
Other, net	(1,165)	291	(1,388)	130
Total other expense	(2,191)	(670)	(3,383)	(1,894)
Income (loss) before income taxes	7,884	386	15,678	(235)
Income tax expense	3,391	2,710	5,727	4,782
Net income (loss)	$ 4,493	$ (2,324)	$ 9,951	$ (5,017)
Basic earnings (loss) per share (in dollars per share)	$ 0.08	$ (0.04)	$ 0.19	$ (0.09)
Diluted earnings (loss) per share (in dollars per share)	$ 0.08	$ (0.04)	$ 0.18	$ (0.09)
Comprehensive income (loss)	$ 8,373	$ (3,714)	$ 15,810	$ (6,877)